Two wheel roller skate

ABSTRACT

A roller skate supporting the load of a person on two wheels centrally aligned with the longitudinal axis of the skate body. The wheels are rotatably mounted on axles carried by brackets pivoted to the body in longitudinally spaced relation for tracking a curved path in response to lateral pressure exerted on the wheels by the person attempting to make a turn. The skate is fastened to the toe portion of the shoe by a strap extending from clips on laterally adjustable rack bars.

United States Patent Steinhiser 1 1 Sept. 26, 1972 [5 TWO WHEEL ROLLERSKATE FOREIGN PATENTS OR APPLICATIONS Inventor: Paul t e 321 Beverly211,859 1/1941 Switzerland ..280/11.25 q r M g y. 46360 741,159 11/1955Great Britain ..280/1 1.23 22 Filed: 10 1970 849 1875 Great Britain..280/11.23

1 1 Applo.2 9,472 Primary Examiner-Benjamin Hersh AssistantExaminerMilton L. Smith 52 us. (:1. ..280/1.1.23, 280/1126, 280/1131Attorney-Clarence A. oBrien and Harvey Jacob- [51] Int. Cl ..A63c 17/06[58] Field of Search..200/l 1.26, 11.25, 11.19-14.28,

200/l1.31,'1l.31-11.34,l1.l,l1.11,ll.23 ABSTRACT A roller skatesupporting the load of a person on two [56] References C'ted wheelscentrally aligned with the longitudinal axis of UNITED STATES PATENTSthe skate hody. The wheels are rotatably mounted on axles earned bybrackets p1voted to the body in 1on- OSbOrn X paced relation fortracking a curved 235,887 12/1880 Mackay 280/1128 in response to lateralpressure exerted on the wheels 2,048,916 7/1936 Bentzlm ..280/11.22 bythe person attempting to make a tum The skate is 2,067,712 1/1937 Knapp..280/11.26 fastened to the toe portion f the Shoe by a Strap 2,100,58411/1937 Wylie ..280/11.31 tending from clips on laterally adjustablerack bars 255,460 3/1882 Ross ..280/11.28 2,633,364 Wiseley ..280/1 1.2815 Claims, 7 Drawing Figures PATENTED SEP 2 6 I972 3,693,988 sum 10FPaul F. Ste/Miser INVENTOR,

WW 29m PATENTED I973 3,693,988

SHEET 2 or 3 /a 74 Paul F. Stem/user 72 76 v 'INVENTOR.

and useful in providing a form or recreation and exer-' cise for theuser. The two-wheeled type of roller skate provided by the presentinvention features, however, certain improvements which enhance theability of the user to maneuver. Fastening of the skate to the shoes isalso facilitated as well as adjustment to different shoe sizes.

In accordance with the present invention, the skate body is providedwith a pair of brackets pivoted thereto in longitudinally spacedrelation to the axles carried by the brackets on which the wheels arerotatable. Centering springs mounted on steering shafts fixed to theskate body and extending through longitudinal slots in the brackets,yieldably hold the brackets and the wheels carried thereby in acentrally aligned position for movement along a straight path. Lateralpressure exerted on the wheels cause pivotal displacement of thebrackets in opposite directions thereby angularly displacing the wheelaxles causing the wheels to track about a curved path inorder toaccommodate turning of the skate from the straight path along which itis normally guided by the wheels.

The skate body is fastened to the shoe of the wearer by means of a strapthreaded through clips pivotally connected to the lateral ends of a pairof rack bars positioned forwardly of the front wheel bracket. The rackbars are held in mesh with a pinion gear formation by means of a guidemember which is held assembled by means of an actuating knob connectedto the pinion gear formation.

These together with other objects and advantages which will becomesubsequently apparent reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming a part hereof, whereinlike numerals refer to like parts throughout, and in which:

FIG. 1 is a side elevational view illustrating a roller skateconstructed in accordance with the present invention.

FIG. 2 is a bottom plan view of the roller skate shown in FIG. 1.

FIG. 3 is a front elevational view of the roller skate shown in FIGS. 1and 2.

FIG. 4 is a partial side sectional view taken substantially through aplane indicated by section line 4-4 in FIG. 2.

FIG. 5 is a transverse sectional view taken substantially through aplane indicated by section line 5-5 in FIG. 1.

FIG. 6 is a transverse sectional view taken substantially through aplane indicated by section line 66 in FIG. 1.

FIG. 7 is a perspective view showing the disassembled parts of theroller skate.

Referring now to the drawings in detail, and initially to FIGS. 1, 2 and3, the roller skate generally referred to by reference numeral 10includes an elongated body generally referred to by reference numeral 12which is supported by a front wheel 14 and a real wheel 16. The wheelsare similar in construction and are rotatably mounted by similarbrackets 18 and 20 respectively carried by a front body section 22 and arear body section24 which are interconnected with each other. The skatebody is adapted to be fastened to the shoe of the user at the toeportion by a fastening assembly 26 mounted by the front section 22forwardly of the front bracket 18.

As shown in FIGS. 1, 2 and 7, the front body section 22 includes a solesupporting surface 28 having a longitudinal recess 30 slidably receivingthe elongated slide portion 32 of the rear body section 24 which extendsfrom the heel supporting surface 34 from which the arcuate heel rest 36projects upwardly. The slide portion 32 of the rear body sectionincludes a plurality of apertures 38 one of which is adapted to bealigned with the aperture 40 in the recess 30 of the front body section22 so that the body sections may be interconnected by means of the screwfastener 42 and the wing nut 44. It will be apparent, that the length ofthe skate body may be adjusted to suit the dimensions of the shoe of theuser.

The front body section 22 is also provided with an aperture 46 as moreclearly seen in FIG. 7 through which a pivotal axis extends about whichthe bracket 18 is pivotally displaceable forwardly thereof. An aperture48, on the other hand, is formed in the rear body section 24 forestablishing a second parallel pivotal axis for the rear bracket 20which extends rearwardly therefrom. Thus, the brackets 18 and 20 areadapted to be pivotally displaced in opposite directions for trackingpurposes as will be hereafter explained. The brackets are otherwise thesame in construction and as more clearly seen in FIG. 7 include a topsurface portion 50 on which ribs 52 are formed to reduce the frictionalcontact area between the bracket and the undersurface of the skate bodysection on which it is pivoted. The apertures 46 and 48 in the bodysections are accordingly provided with weld nuts 54 adapted tothreadedly receive the threaded portions 56 of pivot members 58 havingpivotal bearing portions 60. Each pivot member 58 extends through anaperture 62 formed in the top surface 50 of the pivot bracket. Eachpivot bracket furthermore includes a pair of parallel side portions 64which extend downwardly from the top portion 50 and are providedadjacent the top portion with a pair of aligned longitudinal slots 66.Centrally spaced below the slots 66, are aligned apertures 68 adapted toreceive the axle portion 70 of a bolt having a head portion 72 and athreaded end portion 74. A nut 76 is threadedly received on the threadedportion 74 of the axle bolt in order to hold it assembled between theside portions 64 of the bracket as more clearly seen in FIG. 6.

FIGS. 4 and 6 illustrate the bracket pivotally mounted on the skate bodyby means of the pivot member 58 thereby mounting the wheels on the axleportions 70 between the side portions 64 of the bracket in spacedrelation below the undersurface of the skate body. A pair of inwardlytapered roller bearing assemblies 78 provide an anti-friction supportfor the hub 80 of the wheel which is made of a resilient material suchas rubber. Further, the peripheral surface of the wheel includes ribbedbeveled portions 82 which have been found to enhance the ability of theuser of the skate to execute a turn in cooperation with the steeringmeans to be hereafter described.

As shown in FIGS. 1 and 7, the front and rear sections of the skate bodyare provided with side skirts 84 and 86 having aligned apertures 88 and90 through which pivot members 92 extend. The pivot members 92 aresimilar to the pivot member 58 previously described in connection withthe pivotal mounting of the wheel brackets 18 and 20 and accordinglyeach is provided with a threaded portion and a pivot bearing portionreceived in the aligned apertures 88 and 90. Thethreaded portions of thepivot members 92 are threadedly received withinthe axial end portions ofsteering shafts 94 which are thereby secured to the body sectionsbetween the side skirts 84 and 86 as more clearly seen in FIG. 6. Theaxial end portions of the steering shafts are also externally threadedin order to mount in an axially adjusted position spring retainer 95against which one axial end of centering spring elements 96 abut.Accordingly, a pair of such spring elements 96 are positioned on each ofthe steering shafts 94 and engage therebetween the wheel brackets 18 and20 in order to yieldably hold the same in longitudinally alignedpositions for enabling the wheels to guide movement of the skate bodyalong a straight path. It will be apparent, that any unbalanced lateralpressure applied to a wheel will cause pivotal displacement of thebracket against the bias of the centering springs 96. This pivotalmovement of the wheel bracket is accommodated because the steeringshafts 94 extend through the longitudinal slots 66 in the side portionsof the wheel brackets. As'a result of such pivotal movement of the wheelbrackets, the wheel axles 70 on which the wheels are rotatably mounted,will be displaced from the nominal positions perpendicular to thelongitudinal axis of the skate body. Inasmuch as the wheel bracketsextend from their pivotal axes in opposite directions along thelongitudinal axis of the skate body, the brackets will pivot in oppositedirections so that the rotational axes of the wheels through the axles70 may intersect at some distant center of curvature establishingthereby a curved path along which the skate body is guided by the wheelsin response to the unbalanced lateral pressure applied to the wheels bythe skater when attempting to make a turn.

As shown in FIGS. 1 and 7, the side skirts of the front body section 22are provided with slots 98 through which front and rear rack bars 100and 102 laterally extend forming part of the fastening assembly 26. Thelaterally outer ends of the rack bars are provided with sleeveformations 104 pivotally mounting pivot bars 106 associated with buckleclips 108. The pivot bar 106 of each buckle clip interconnects withangularly related leg portions 110 to which guide bars 112 areconnected. Thus, a strap 1 14 may be threaded between the guide bars 112in engagement with the sleeve formations 104 for securing the skate bodyto the top forward portion of the shoe. Different size shoes areaccommodated by adjusting the lateral spacing of the sleeve formations104 at the ends of the rack bars 100 and 102.

Lateral adjustment of the rack bars is effected by means of an actuatingknob 116 located below the underside of the front body section 22. Theactuating knob 116 is connected by means of a pin 118 to the lower endportion 120 of a pivot member 122 having a slotted head portion 124 andan intermediate pinion gear formation 126. Thus, as more clearly seen inFIG.

5, the actuating knob 116 when secured by the pin 1 18 to the pivotmember 124, holds a guide member 128 assembled in abutment with theunderside of the front body section 22. The guide member includesflanges 130 as more clearly seen in FIG. 7 which abut the underside ofthe front body section between which the rack bars and 102 are slidablyheld in meshing engagement with the pinion gear formation 126. Anaperture 132 is formed in the guide member dimensioned to receive theend portion which is of smaller diameter than the pinion gear formation126. A diametrically larger bearing portion 134 is formed on the pivotmember 122 below the head portion 124 so, as to rotatably mount thepivot member in the aperture 136 formed in the front body section asshown in FIGS. 5 and 7. Thus, the actuating knob 116 will not only holdthe fastening assembly 26 assembled on the front skate body section, butwill also enable the fastening assembly to be laterally adjusted byrotation of the pinion gear formation.

The foregoing is considered as illustrative only of the principles of.the invention. Further, since numerous modifications and changes willreadily occur to those skilled in the art, it is not desired to limitthe invention to the exact construction and operation shown anddescribed, and accordingly all suitable modifications and equivalentsmay be resorted to, falling within the scope of the invention asclaimed.

What is claimed as new is as follows:

1. In a roller skate having an elongated body and a pair of wheelsnominally aligned with a plane containing a central longitudinal axis ofthe body, a pair of brackets having axles rotatably mounting saidwheels, each of said brackets being pivotally mounted on the body abouta pivotal axis intersecting the longitudinal axis in said plane andspaced from the axle, and steering means mounted by said body andengageable with the bracket for yieldably resisting pivotal displacementthereof by unbalanced lateral pressure on the wheels, said steeringmeans including a shaft fixed to said body in perpendicular relation tothe longitudinal axis, said bracket having longitudinal slots throughwhich said shaft extends in longitudinal spaced relation to the pivotalaxis, and centering spring means mounted on the shaft for holding thebracket in a position with said wheel aligned with said plane.

2. The combination of claim 1 wherein the pivotal axes arelongitudinally spaced from the axles of the associated brackets inopposite directions respectively.

3. The combination of claim 2 wherein each of said wheels is made of aresilient material having a peripheral surface which includes laterallybeveled portions with rib formations thereon.

4. The combination of claim 3 wherein said body includes front and rearsections respectively mounting the brackets, and fastening meansextending laterally from the front section of the body on the same sideof the pivotal axis as the axle associated with the bracket mounted bythe front section.

5. The combination of claim 4 wherein said fastening means includes apair of rack bars, an assembly pin rotatably mounted by the frontsection of the body having a pinion gear formation thereon in mesh withsaid rack bars, guide means through which the rack bars slidably extendfor holding the same in mesh with the a pinion gear formation, andactuating means connected to the assembly pin for holding the guidemeans in abutment with the body and laterally adjusting the rack bars.

6. The combination of claim 5 wherein said fastening means furtherincludes a pair of buckle clips, each having angularly related legportions extending from a pivot bar and guide bars connected to the legportions in spaced relation to the pivot bar, sleeve formations mountedon the rack bars through which the pivot bars extend, and a strapentrained about the guide bars against the sleeve formations.

7. In a roller skate having an elongated body and a pair of front andrear wheels, said wheels nominally aligned with a plane containing acentral longitudinal axis of said body, a pair of brackets having axlesrotatably mounting said wheels, each of said brackets being pivotallymounted intermediate of said wheels in contact with said body about apivotal axis intersecting the longitudinal axis in said plane and spacedfrom the axle, front and rear side skirts depending from said body, saidbrackets disposed laterally inwardly of said depending side skirtportions, and steering means mounted between said side skirts andsubstantially perpendicular thereto, said steering means includingresilient spring means seated on said brackets for yieldably resistingpivotal displacement thereof by unbalanced lateral pressure on saidwheels.

8. The combination of claim 7 wherein the pivotal axes arelongitudinally spaced from the axles of the associated brackets inopposite directions respectively.

9. The combination of claim 8 wherein said body includes front and rearsections respectively mounting the brackets, and fastening meansextending laterally from the front section of the body on the same sideof the pivotal axis as the axle associated with the bracket mounted bythe front section. I

10. The combination of claim 7 wherein said body includes front and rearsections respectively mounting the brackets, and fastening meansextending laterally from the front section of the body on the same sideof the pivotal axis as the axle associated with the bracket mounted bythe front section.

11. In a roller skate having an elongated body and a pair of front andrear wheels nominally aligned with a plane containing a centrallongitudinal axis of the body, a pair of brackets having axles rotatablymounting said wheels, each of said brackets being pivotally mountedintermediate of said wheels about a pivotal axis intersecting thelongitudinal axis in said plane and spaced from the axle, front and rearskirt portions depending from said body, steering means mounted on'saidfront and rear skirt portions and engageable with said brackets foryieldably resisting pivotal displacement thereof by unbalanced lateralpressure on said wheels, said body including front and rear sectionsrespectively mounting the brackets, and fastening means extendinglaterally from the front section of the body on the same side of thepivotal axis as the axle associated with the bracket mounted by thefront section, said fastening means including a pair of rack bars, anassembly pin rotatably mounted by the front section of the body having apinion gear formation thereon in mesh with said rack bars, guide meansthrough which the rack bars slidably extend for holding the same in meshwith the pinion gear formation, and actuating means connected to theassembly pin for holding the guide means in abutment with the body andlaterally adjusting the rack bars.

12. In a roller skate having an elongated body and a pair of wheelsnominally aligned with a plane containing a central longitudinal axis ofthe body, a pair of brackets having axles rotatably mounting saidwheels, each of said brackets being pivotally mounted on the body abouta pivotal axis intersecting the longitudinal axis in said plane andspaced from the axle, and steering means mounted by the body andengageable with the bracket for yieldably resisting pivotal displacementthereof by unbalanced lateral pressure on the wheels, said bodyincluding front and rear sections respectively mounting the brackets,and fastening means extending laterally from the front section of thebody on the same side of the pivotal axis as the axle associated withthe bracket mounted by the front section, said fastening means includinga pair of rack bars, an assembly pin rotatably mounted by the frontsection of the body having a pinion gear formation thereon in mesh withsaid rack bars, guide means through which the rack bars slidably extendfor holding the same in mesh with the pinion gear formation, andactuatingmeans connected to the assembly pin for holding the guide meansin abutment with the body and laterally adjusting the rack bars, saidfastening means further including a pair of buckle clips, each havingangularly related leg portions extending from a pivot bar and guide barsconnected to the leg portions in spaced relation to the pivot bar,sleeve formations mounted on the rack bars through which the pivot barsextend, and a strap entrained about the guide bars against the sleeveformations.

13. In a roller skate having an elongated body and a pair of wheelsnominally aligned with a plane containing a central longitudinal axis ofthe body, at least one bracket having an axle rotatably mounting one ofthe wheels, means pivotally mounting the bracket on the body about apivotal axis intersecting the longitudinal axis in said plane and spacedfrom the axle, and steering means mounted by the body and engageablewith the bracket for yieldably resisting pivotal displacement thereof byunbalanced lateral pressure on the wheel, said steering means includinga shaft fixed to the body in perpendicular relation to the longitudinalaxis, said bracket having longitudinal slots through which the shaftextends in longitudinal spaced relation to the pivotal axis, andcentering spring means mounted on the shaft for holding the bracket in aposition with said wheel aligned with said plane.

14. In a roller skate having an elongated body, fastening meansextending laterally from the body including a pair of rack bars, anassembly pin rotatably mounted by the front section of the body having apinion gear formation thereon in mesh with said rack bars, guide meansthrough which the rack bars slidably extend for holding the same in meshwith the pinion gear formation, and actuating means connected to theassembly pin for holding the guide means in abutment with the body andlaterally adjusting the rack bars.

15. The combination of claim 14 wherein said fastening means furtherincludes a pair of buckle clips, each having angularly related legportions extending from a pivot bar and guide bars connected to the legportions in spaced relation to the pivot bar, sleeve formations mountedon the rack bars through which the pivot bars extend, and a strapentrained about the guide bars against the sleeve formations.

a: a a

1. In a roller skate having an elongated body and a pair of wheelsnominally aligned with a plane containing a central longitudinal axis ofthe body, a pair of brackets having axles rotatably mounting saidwheels, each of said brackets being pivotally mounted on the body abouta pivotal axis intersecting the longitudinal axis in said plane andspaced from the axle, and steering means mounted by said body andengageable with the bracket for yieldably resisting pivotal displacementthereof by unbalanced lateral pressure on the wheels, said steeringmeans including a shaft fixed to said body in perpendicular relation tothe longitudinal axis, said bracket having longitudinal slots throughwhich said shaft extends in longitudinal spaced relation to the pivotalaxis, and centering spring means mounted on the shaft for holding thebracket in a position with said wheel aligned with said plane.
 2. Thecombination of claim 1 wherein the pivotal axes are longitudinallyspaced from the axles of the associated brackets in opposite directionsrespectively.
 3. The combination of claim 2 wherein each of said wheelsis made of a resilient material having a peripheral surface whichincludes laterally beveled portions with rib formations thereon.
 4. Thecombination of claim 3 wherein said body includes front and rearsections respectively mounting the brackets, and fastening meansextending laterally from the front section of the body on the same sideof the pivotal axis as the axle associated with the bracket mounted bythe front section.
 5. The combination of claim 4 wherein said fasteningmeans includes a pair of rack bars, an assembly pin rotatably mounted bythe front section of the body having a pinion gear formation thereon inmesh with said rack bars, guide means through which the rack barsslidably extend for holding the same in mesh with the pinion gearformation, and actuating means connected to the assembly pin for holdingthe guide means in abutment with the body and laterally adjusting therack bars.
 6. The combination of claim 5 wherein said fastening meansfurther includes a pair of buckle clips, each having angularly relatedleg portions extending from a pivot bar and guide bars connected to theleg portions in spaced relation to the pivot bar, sleeve formationsmounted on the rack bars through which the pivot bars extend, and astrap entrained about the guide bars against the sleeve formations. 7.In a roller skate having an elongated body and a pair of front and rearwheels, said wheels nominally aligned with a plane containing a centrallongitudinal axis of said body, a pair of brackets having axlesrotatably mounting said wheels, each of said brackets being pivotallymounted intermediate of said wheels in contact with said body about apivotal axis intersecting the longitudinal axis in said plane and spacedfrom the axle, front and rear side skirts depending from said body, saidbrackets disposed laterally inwardly of said depending side skirtportions, and steering means mounted between said side skirts andsubstantially perpendicular thereto, said steering means includingresilient spring means seated on said brackets for yieldably resistingpivotal displacement thereof by unbalanced lateral pressure on saidwheels.
 8. The combination oF claim 7 wherein the pivotal axes arelongitudinally spaced from the axles of the associated brackets inopposite directions respectively.
 9. The combination of claim 8 whereinsaid body includes front and rear sections respectively mounting thebrackets, and fastening means extending laterally from the front sectionof the body on the same side of the pivotal axis as the axle associatedwith the bracket mounted by the front section.
 10. The combination ofclaim 7 wherein said body includes front and rear sections respectivelymounting the brackets, and fastening means extending laterally from thefront section of the body on the same side of the pivotal axis as theaxle associated with the bracket mounted by the front section.
 11. In aroller skate having an elongated body and a pair of front and rearwheels nominally aligned with a plane containing a central longitudinalaxis of the body, a pair of brackets having axles rotatably mountingsaid wheels, each of said brackets being pivotally mounted intermediateof said wheels about a pivotal axis intersecting the longitudinal axisin said plane and spaced from the axle, front and rear skirt portionsdepending from said body, steering means mounted on said front and rearskirt portions and engageable with said brackets for yieldably resistingpivotal displacement thereof by unbalanced lateral pressure on saidwheels, said body including front and rear sections respectivelymounting the brackets, and fastening means extending laterally from thefront section of the body on the same side of the pivotal axis as theaxle associated with the bracket mounted by the front section, saidfastening means including a pair of rack bars, an assembly pin rotatablymounted by the front section of the body having a pinion gear formationthereon in mesh with said rack bars, guide means through which the rackbars slidably extend for holding the same in mesh with the pinion gearformation, and actuating means connected to the assembly pin for holdingthe guide means in abutment with the body and laterally adjusting therack bars.
 12. In a roller skate having an elongated body and a pair ofwheels nominally aligned with a plane containing a central longitudinalaxis of the body, a pair of brackets having axles rotatably mountingsaid wheels, each of said brackets being pivotally mounted on the bodyabout a pivotal axis intersecting the longitudinal axis in said planeand spaced from the axle, and steering means mounted by the body andengageable with the bracket for yieldably resisting pivotal displacementthereof by unbalanced lateral pressure on the wheels, said bodyincluding front and rear sections respectively mounting the brackets,and fastening means extending laterally from the front section of thebody on the same side of the pivotal axis as the axle associated withthe bracket mounted by the front section, said fastening means includinga pair of rack bars, an assembly pin rotatably mounted by the frontsection of the body having a pinion gear formation thereon in mesh withsaid rack bars, guide means through which the rack bars slidably extendfor holding the same in mesh with the pinion gear formation, andactuating means connected to the assembly pin for holding the guidemeans in abutment with the body and laterally adjusting the rack bars,said fastening means further including a pair of buckle clips, eachhaving angularly related leg portions extending from a pivot bar andguide bars connected to the leg portions in spaced relation to the pivotbar, sleeve formations mounted on the rack bars through which the pivotbars extend, and a strap entrained about the guide bars against thesleeve formations.
 13. In a roller skate having an elongated body and apair of wheels nominally aligned with a plane containing a centrallongitudinal axis of the body, at least one bracket having an axlerotatably mounting one of the wheels, means pivotally mounting thebracket on the body about a pivotal axis intersecting the longitudinalaxis in said plane and spaced from the axle, and steering means mountedby the body and engageable with the bracket for yieldably resistingpivotal displacement thereof by unbalanced lateral pressure on thewheel, said steering means including a shaft fixed to the body inperpendicular relation to the longitudinal axis, said bracket havinglongitudinal slots through which the shaft extends in longitudinalspaced relation to the pivotal axis, and centering spring means mountedon the shaft for holding the bracket in a position with said wheelaligned with said plane.
 14. In a roller skate having an elongated body,fastening means extending laterally from the body including a pair ofrack bars, an assembly pin rotatably mounted by the front section of thebody having a pinion gear formation thereon in mesh with said rack bars,guide means through which the rack bars slidably extend for holding thesame in mesh with the pinion gear formation, and actuating meansconnected to the assembly pin for holding the guide means in abutmentwith the body and laterally adjusting the rack bars.
 15. The combinationof claim 14 wherein said fastening means further includes a pair ofbuckle clips, each having angularly related leg portions extending froma pivot bar and guide bars connected to the leg portions in spacedrelation to the pivot bar, sleeve formations mounted on the rack barsthrough which the pivot bars extend, and a strap entrained about theguide bars against the sleeve formations.